I'm wondering if I'm alone in this - I seem to have come across a compatibility conflict with various versions of Zettlr and OCL.
When OCL updated to vers 2.2.x Zettlr 3.3.x - 3.4.x broke in that the app pretty much froze on open eventually showing a single colored (orange/red?)screen and completely freezing requiring a 'force quit' - after a fair amount of troubleshooting a work around fix of reverting Zettlr to vers 3.3.0.
With OCL's recent update to 2.3.x Zettlr 3.3.0 has now failed as well, the workaround fix (for now) has been to revert Zettlr further to Vers 3.2.3.
NB: I need OCL to be current to ensure I can keep running the latest versions of macOS on my 2013 MacPro (6,1) in my home office space.
pete